A single-layer factory-made roofing sheet used on flat roofs — the modern alternative to traditional multi-layer built-up roofing.
A factory-manufactured roofing sheet applied in a single layer, as opposed to the multiple-ply construction of built-up roofing. Single-ply membranes are divided into thermoset (EPDM) and thermoplastic (TPO, PVC) categories. They can be installed ballasted, mechanically attached, or fully adhered and offer advantages in speed of installation and ease of future modification.
The single-ply TPO membrane was mechanically attached with 6-inch fastener spacing at the perimeter and 12-inch spacing in the field.
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